<p>A rare earth metal extractant in the form of a dialkyl diglycol amic acid is synthesized by reacting diglycolic anhydride with a dialkylamine in an aprotic polar solvent, with a molar ratio of dialkylamine to diglycolic anhydride being at least 1.0, and removing the aprotic polar solvent.</p>
申请公布号
EP2404893(B1)
申请公布日期
2013.11.27
申请号
EP20110172278
申请日期
2011.06.30
申请人
SHIN-ETSU CHEMICAL CO., LTD.;NISSIN CHEMICAL INDUSTRY CO., LTD.